If you're an Iron Giant fan (book and/or movie) and a Pete Townshend fan, I recommend getting Pete's The Iron Man CD (available mostly in close-outs, unfortunately); it was his attempt to adapt the story as a musical, with his ultimate goal to make a musical film (note that Pete is one of the executive producers of Bird's film). The CD is actually much more faithful to the original story. (YouTube video of "A Friend is a Friend" is here.)
If you have the latest, special edition release of the film on DVD, I also highly recommend watching the extras - there's a good featurette on the making of the film.
If you have the latest, special edition release of the film on DVD, I also highly recommend watching the extras - there's a good featurette on the making of the film.